Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8776f2c00bbb89…

MALICIOUS

PDF

69.3 KB Created: 2020-12-23 05:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ee8c5784ba11d23cf9e31252f62bcc79 SHA-1: 9ba627d4f5249792f270f887a8fa9cd76a3c08fd SHA-256: fa8776f2c00bbb898afb1bb0e0523a1fba385460a5c014b34f8c05f311ea9b2a
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links pointing to various domains, indicating it functions as a link farm. One of the primary links directs to a known malicious redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for users to visit compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?utm_term=cossacks+3+units+stats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_5f8e9d1c79995.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/ragaxomuli.pdfIn PDF document text
    • https://bujopovuw.weebly.com/uploads/1/3/4/3/134390204/6987726.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/8309994.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/9265371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5fcccf8e7c9f9.pdfIn PDF document text
    • https://xodunutejoxefis.weebly.com/uploads/1/3/4/4/134476009/jalitazumuda.pdfIn PDF document text
    • https://javesobasi.weebly.com/uploads/1/3/4/7/134736097/4470512.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/15187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5fa81b531e97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f8d51f881292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501042/normal_5fbe6e315f30b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_5fd68db99f65a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5fac34e682698.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/52642485172.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 4800 bytes
SHA-256: 2e170aaae82dd3d8cb3444860ce0c9f1d9e7dc83d302026f099d9e6e0a0c0601
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 10732 bytes
SHA-256: 1c95c9a3a6b239f268c9abf281a683c82adaf5c05082d8795b5b775b145aa2ce

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